Open-hearth-furnace construction



Juy l, 1930. G. L. DANF-ORTH, 1R 1,769,367

`OPEN 'HEARTH FURNACE CONSTRUCTION Filed Nov. 28, 1921 Patented `luly l, 193v UNITED l STATES GEORGE L. DANrorvrn, Ja., or CHICAGO;

PATENT lo`l=r1cla1lI l ILLINoI-s,v Assrefnort, BY Mnsnn .essIGN- MENTS, TO OPEN HEARTH COMBUSTION COMPANY, F GHICAGO,.ILLINOIS, A COR- PORATION OF DELAWARE orEN-nnAnTn-FURNACE oonsrnuc'rrorr Application -led November 28, 1921. Serial No. 518,258.

double ended land are periodically reversed p Ain their operation. Each end o f vthe furnace thus serves alternately to introduce the air and fuel'and to carry off the products of combustion.` The products of combustion are much' higher. in temperature than' the incomin .air and 4fuel and greatly exceed the air and uel in volume. It is, therefore, necessary to so proportion ports and passages'` of the furnace astoadequately carry off the large volume of the products of combustion. Obviously, when fso proportioned, the ports and passages exceed in size the area necessary to properly introduce the air and fuel.

This excess size of the ports and passages renders it diflicultto adequately control the mixture ofthe air and fuel and thus to control the length and direction of the'iame.

A further difficulty with such furnaces lies in the fact that the outgoing products 'of combustion are of such a temperature as to wear away those portions of the furnace walls which Adefine the ports. This wearing away tends to makemore difficult the control of the air and gas. l

It is an object of thepresent'invention to provide port defining means in an open hearth or similar furnace which means are movable into and out of operative position. Itv is a further object to provide such means which will adequately direct the in:

coming air and'fuel when in 'the operative 40 position and which -will leave the passages bustionwhen in the inoperativeposition. .It.is also an object to provide port defining means'which upon theoutgoing end are withdrawn from the path "of the' heated outgoing gases. It is an yadditional object to provide a port construction which may be applied to existin furnaces without material alterartions t Aerein.

.. which clear for carrying off the products -of comfv Other yand further objects will appear as the description proceeds.'

Broadly, my invention comprises movable means associated with the air and fuel passages of a metallurgical furnace in such a manner as to selectively form restrictedV `stricted the full opening of saidv passages.

ln the `particular form. which I have .chosen for purposes of illustratiomthis portA defining means comprises a hood; movable and'slidable throughthe end of thefurnace and ada ted when ,in its inner position to .form a orwardly opening port for the fuel y uptake and' to cooperate with thefurnace walls and air -uptakes to form air ports `straddling the gas port. Y

I have illustrated this preferred embodiment in the accompanying drawings, in

, @Figure .l lsection showing one port end of4 an open hearth furnace with my invention appliedthereto. y Y

Figure 2 is a sectiontaken on line 2--2 of Figure 1; and r s Figure 3 is a section taken on Vline 3--8 of Figure 2.

Referrin now to the drawings, the furnace' has t e melting chamber 5, the roof 6, the air .uptakes 7 and the 4gas uptake 8. That portion of the furnace between the uptakes and the'melting chamber is somewhat orts for such passages or Ato leave unre ,7o is` a. fragmentary longitudinal restricted by theinwardly projecting piers 9. As bestshown in Figure 3, longitudinally extending guideways 10 are provided upon either side of the gas u `take 8. I guideways as shown, are preferably be water cooled. Fitting upon these guideways is vthe 'hood 1l provided with the water cooled frame 1 2. This hood is movable through .the opening 1 -3 and through the end wall 14 of the furnace to theffdotted line position o f Figure 1.'

ffWhen in its inner position, asbest shown `in Figure l, the hood forms a gas port of usual contour. This portvolirectsv the gas These ollow and will stream into the melting chamber.. As best shown in Fi res 2 and 3, the hood also cooperates with theV furnace roof and the piers 9 to restrict the passage space between the air uptakes 7 and the melting chamber. 'As shown in Figure 3, these two uptakes join straddling the hood and forming ltheair port. Air thus enters in a blanketing stream upon -the sides and top of the gas stream.

When the hood is removed to its outer position, the three uptakes are entirely unrestricted by the hood and their. full area is 10 effective to carry off the products of combustion'. The hood in its outer position also is` out of path of the heated discharge gases and is not worn away by their action, and the life ofthe port is thus materially increased.

While I have 4shown onepreferr'ed form of my invention it is obvious that it may be modified in many ways to cooperate withvarious forms of passages and furnaces. It is my intention'to cover all such modifications to meet varying conditions as come within the spirit and scope of the following claims."

l. In a reversible metallurgical furnace, -laterally spaced air and fuel passages and means slidable longitudinally of the furnace associated with an intermediate 'assage adapted toyform a'restricted port or' said '30 passage and a -deflecting wall adjacent the lateral passages.

2. In a reversible-metallurgical furnace,

laterally spaced air and fuel passages and movable means associated with an intermediate passage adapted to form a restricted port `for said passage, said means being located spaced from the furnace walls as to cooperate with said walls to form restricted ports for the laterally placed passages.

8.' In a reversible'metallurgical furnace,

a fuel uptake, air uptakes located laterally of the fueluptake, and movable'means associated 4with said uptakes and adapted to /form a restricted port for the fuel uptake and deiecting walls adjacent the air uptakes. Y

4.1In va reversible metallurgical furnace, a fuel uptake, air uptakes located adjacent the fuel uptake, and a movable hood associated with the fuel uptake in such manner as to form a forwardly extending port therefor and to form'deflecting walls adjacent the air uptakes.

5. In a reversible metallurgical furnace, a fuel uptake, air uptakes located laterally vof the fuel uptake, and a'hood slidably associated with the fuel uptake in such manner as to form al forwardly extending port therefor and to form deflecting walls adjacent the air uptakes.

6. In a reversible metallurgical furnace, a fuel uptake, air uptakes located laterally of the fuel uptake, and a movable hood associated with the fuel uptake in such manner 65 as to form a forwardly'extending port therefor, said hood' being so related to the furnace walls as to cooperate with said walls` to form restricted ports foi` the air uptakes. 7. In a reversible metallurgical furnace,

a fuel uptake, air uptakes located laterallyA `to form restricted ports for' the air uptakes which portsl straddle the hood forming the gas port. 4 8. In a reversible metallurgical furnace,

Aa fuel uptake, air uptakes located adjacent the fuel uptake, and means slidable longi-` tudinally through the furnace wall associated with said uptakes and adapted to .form restricted ports for the uptakes.

9, In a reversible metallurgical'furnace, air and fuelV assages and movable means associated wit said Vpassages adapted to form a restricted port'for the fuel passage, and deflecting walls adjacent the air passage, said means being adapted in one position to leave all said passages unrestricted. '10,'. In a reversible metallurgical furnace,

a fuel uptake, air uptakes'located adjacent the fuel uptake, and means slidable longitudinally through the furnace wall associated with said uptakesand' adapted to form restricted ports for the uptakes, saidv means H being vadapted invitsouter position to leave the openings of allsaid uptakes unrestricted.

ll. In a reversible metallurgical furnace, three laterally spaced uptakes, guideways .located laterally' of the'central uptake, and

a hood'slidable throughthe end wall" of the furnace upon said guideways, the hood .forming ,a forwardly facing portJ for thecentral uptake when in its inner: position.

l2. In a reversible metallurgical furnace, three laterally spaced uptakes, guideways located laterally of the central uptake, 'and a hood slidable through the end wallof the furnace Aupon said guideways, the hood forming a forwardly facing port for the central uptake when in its inner position and being of such height as to allow aclearance between the hood and furnace roof whereby ports straddling the central port are formed for the side uptakes.

y 13. In a furnace of the character describe having fluid passages, of a port arranged at each end of the furnace,'jsaid ports being' adapted to .be alternately'p'rojected within the furnace and removed therefrom, a ysupporting structure for e'achffrport, said structures being mounted at the ends of the furnace and communicating with said passages, water-cooled means for both the ports and ,said supporting structures, and said ports being slidably mounted on said supporting structures and controlling the admittance and dischargeof said fluids to 'and from the furnace through said supporting struc-l f tures for the purposefspecied. A

r "14. An end construction for regenerative` open hearth furnaces having a throat .o eninginto the hearthQan uptake ue lea 'ng te said throat,-' and a member movable across 1 theuptake toward'oraw'a from said throat to vary as desired the e ective area of the other. to control mouths.

other and one o 17, In areverberatory furnace, a headhaving air andgas ports and means to 'vary the relative area ofthe mouths of said ports, the area of the airport being unequal- 4 1y distributed around .said gas port.

" 18. In a reversible metall'urglcal furnace,

a fuel uptake, an air uptake located adjacent 4the fuel uptake, and means slidable longi- 3-6 tudinally through the'kfurnace wall associatrestricted ports for the uptakes. y

' Signed at` Chicago,-I11inois, this` 23rd day ed with said uptakesfand adapted form of November, 1921.

. GEORGE L. DANFORTHQJR.

a reverberatory furnace, 4a furnace* head having'air and gasports and. means Y 'to move. one of the ports with respect to the the relative .areas of their V16. In`a reverberatory furnace,l a furnace head having an air port and a 'gas port, one of the ports being Atapered with respect to the lsaid ports movable longl tudinallyof the tapered port to control the.'

dischargearea at its mouth. v i furnace 

